refactor: enforce ktx naming and AGENTS.md compliance sweep (#289)

Align the tree with AGENTS.md/CLAUDE.md conventions:

- Rewrite user-facing strings, docs, and tests to lowercase `ktx`
  (no bare uppercase `KTX` tokens remain outside literal identifiers).
- Drop the legacy `historicSql` migration path and its now-unused
  helpers, per the no-backward-compat rule.
- Remove `as unknown as` / `any` casts: narrow `BaseTool` generics to
  `z.ZodObject`, add a typed `createLookerClient`, and delete the dead
  `getParametersSchema`/`toAnthropicFormat` pre-AI-SDK helpers.
- Use `InvalidArgumentError` for Commander parse failures.
- Finish the adapter→connector prose conversion in the `ktx.yaml` docs
  while keeping the literal `adapters` config key.

packages/cli/src/managed-python-daemon.ts

@@ -21,7 +21,7 @@ export class ManagedPythonDaemonStartError extends Error {
   readonly detail: string;
   readonly stderrLog: string;
   constructor(detail: string, stderrLog: string) {
-    super(`KTX daemon failed to start: ${detail}. stderr: ${stderrLog}`);
+    super(`ktx daemon failed to start: ${detail}. stderr: ${stderrLog}`);
     this.name = 'ManagedPythonDaemonStartError';
     this.detail = detail;
     this.stderrLog = stderrLog;
@@ -720,7 +720,7 @@ export async function startManagedPythonDaemon(
     );
     child.unref();
     if (!child.pid) {
-      throw new Error(`KTX daemon did not report a pid. stderr: ${layout.daemonStderrPath}`);
+      throw new Error(`ktx daemon did not report a pid. stderr: ${layout.daemonStderrPath}`);
     }
     const state: ManagedPythonDaemonState = {
       schemaVersion: 1,